Controlling the temporal response of mass spectrometers for...

H - Electricity – 01 – J

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H01J 49/42 (2006.01)

Patent

CA 2439519

A method and apparatus for operating a mass spectrometer system, having a processing section, provides for the application of both an axial field and periodic application of a flush pulse to the processing section. This gives a reproducible output ion signal from the processing section that is very responsive to changes in operating conditions in the processing section. The mass spectrometer system can comprise: a collision/reaction cell having an input and an output; and a set of elongated rods extending between said input and output, said elongated rods spatially arranged. Separate auxiliary electrodes can be provided to generate the axial field. The invention has particular applicability to ICP-MS, where strong ion currents can result in a collision cell taking some time to reach equilibrium when the operating condition is changed.

Procédé et dispositif servant à mettre en service un système de spectrométrie de masse possédant une section de traitement, ce qui consiste à appliquer à la fois un champ axial et une impulsion d'alignement périodique à la section de traitement. Ceci permet d'obtenir un signal de sortie ionique reproductible extrêmement sensible à des modifications des conditions opérationnelles de la section de traitement. Ce système de spectrométrie de masse peut comprendre : une cellule de collision/réaction possédant une entrée et une sortie, et un ensemble de tiges allongées s'étendant entre ladite entrée et ladite sortie, lesdites tiges allongées étant disposées dans l'espace. Des électrodes auxiliaires séparées peuvent servir à générer le champ axial. L'invention est particulièrement appropriée en ICP-MS où des courants inioniques puissants peuvent produire une cellule de collision nécessitant une certaine durée de reprise d'équilibre dans le cas de modification des conditions opérationnelles.

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